Weighing-machine.



I. C. GRAHAM.

WEIGHING MACHINE.

APPLICATION FILED MAR. so, 1908.

Patented Apr 13, 1909.

Subemkoz pr /n1 CETQIQTI'I iZ M Guam,

UNITED STATES PATENT OFFICE.-

JOHN CALVIN GRAHAM, or" GRANDVIL'LE, MICHIGAN.

WEIGHING-MACHINE Speciflcatipn of Letters Patent.

Patented Apr-H18, 19092,

Application filed March so, 1903. senaino. 424,29."

bottoms of. t e weighing trays and retain a portion of the material in the bottoms of the traysgwhen'they are reversed, and its objects are: first, .to provide a'rotary weighing machine witln which the last particle of the material being weighed will be discharged from the trays as soon as they are reversed for emptying. Second, to provide a means for holding the pulverized material in the hopper 2 While the trays are being reversed, thus-averting the danger of scattering-thefinely pulverized material into the receiving conveyor 01' about the apartment .in which the material is being'handled, and, third, to provide a means of. conveying the weighed material from the receiving 'conveyer to the cartons in whichit is to be packed and shipped, and to convey said cartons from under said re 5 ceiving conveyor. 1 accomplish these objects by the mechanism illustrated in the accompanying drawings in which- Figure 1 is an elevation of the weighing device with the hopper and the receiving conveyer shown in section to illustrate the manner of conveying the pulverized material to and from the weighing trays. Fig. 2 is an elevation of the weighing trays detached, I showing an air space between their adjacent ends. Fig. 3, is a top plan of the tray and balancing arm that supports it, and Fig. 4 is an elevation of the trays shown in section on line as :r'of- Fig. '3, showing the location and movement of the valves in the ends of the trays for the entrance ofair so that the material will all fall out of the trays as soon as they'have been reversed after having been filledwith plaster, cement, flour or any other finely ulverized material.

. am aware that rotary weighing machines of Michigan, have invented certain new and closely enou 'h-to become embedded in the Sim ar letters refer .g to' similar parts throughout theseveral views.

are common for weighing grains. but.

for this purp6se,the grain being smoothinkernels: of 'suflicient. size. so that a1r spaces:

exist between the kernels and all will roll'or.

slide out of the trays without difiioulty,..but,. i any material that is so 'finely pulverlz'e'd as."

l preclude the possibility of any air intere: lmingling with the particles to hold them [apart or to allow of their ready separation,

' lto pack together so closely as; to practically,-

will adhere in a, ractically, concrete mass in the corners and ottom' of thet'rays unless" some means is rovided for admitting air below or back of it, which has not been provided for in any of thetrays so farprovlded for this class of machinesandas this machine is designed expressly for use in weigl finely pulverized land paris, and Portland cement Iffind it. essen r plaster or plaster.-

tially necessary to provide against the ad- .hesive nature of the particles, and have constructed my machine as follows: if if;

The" plaster O is passed from. the grindingor mixlng machinery into the conveyer or. hopper A where it is conveyed. to an op.en-' ing, (1, on the bottom ofthe conveyer, by means of any suitable form' of conveying; device, preferably a shaft, as- B, having :a. screw flange thereon. The trays E E aremade in pairs standing end to end, as shown? and have a space, as E betweeni themfor the free passage of air, and in. the bottom of each tray I place-air valves, as-Ef, pivoted,

as at g 9 so that the opposite edges may swing freely 'up and down,-as-ind1cated'.in

Fig. 4, but the opposite ends of the trays are a dust tight bottom to support the tray full.

of the material, but when the tray is reversed for em tying the material out. of it the valves w open sufficiently to allow air to enter the tray back of or above the material so that there-will be no ossibility of the material adhering to the 'si es or bottom of the trays and failing toempty the trays completely, the air for operating said valves being admitted through the space vE" be tween the adjacent ends of the. trays. These-- trays are .pivotally supported bythe. lever or scale beaniF, as at f, so thatthey may be'made to revolve easily" thereon, and the scale armis pivotally supported, as at f,

and provided with'a weight G at the back end so thatthe-emptytrays be held up back to the osition ll fized material passing to the position indicatcdhy the in F1 .1 until the operanicu l into one, -en it conveyer belt 51'." to be conveyed to any: de-' sired place for paclnng efter the tray carries theni by the solid t he caught hespring (if i the conveyor the projection c has been emptied the lines so that t 1e opposi and held by the proj is placed upon the Lt in position to drop b and avert theldanger or hopper swinging backward when it is steep hy' the projection a. 1

To avert the danger of e finely pulver- QOIF 7 Us LI y pivoted to when the trays are passing their contents, I place a gate the bottom ct theconveyer, a

' tion so that as the tray starts t o pass from cated by the dotted since D gate closed untd a sulficient amount 01' meunder the conveyor the projection 12 on the tray will engage the and force it to position to close the opening 155, and the Weight D will e carr hold the terial has been conveyed to the to overcome the eight of the eight if), by which time the returning tray will have assumed positlon to srecelve the material as the gate opens. I 4 1 The weight G is made With the top terminatmg in a point to avert the danger oi nne particles of plaster. or other dust collecting upon it and hiterferiug with the accuracy of Weight desired, i

To avert the danger of the gates E opening too Wide or remaining open after the trhas assumed position for r eceiving mater- Ll from the conveyor 1 findi it Well to place stops, as q, in position to datch and support thorn While the material is iiassing out of the tray, and prefer the use of. small v: indicated, though I do not deer strict myself from using any for. stop or valve that may made avail the purposes herehihcl'ore stated.

Having thus described my inventio I claim as new, and. desire to seed ters Patent of the United Sta:

1.. The combination in ro ary 4 machine, of trays eyes at one end.

placed ed. to the position iudi- 4 n arnet-d5 ""ructed to stand Withthe' open end upward receive material and to. he turned with the open end downward to discharge material. a lever and weight'to balance and weigh the trays-and material, a conve or, a gate piv cted in conveyor in posi ion to L e-actuated by the trays to preventtioefiow of ma terial. from the couveyer when the trays are not in po "tion to'receiveit, and valves in the adiacent ends 0! the trays arranged to open and admit air above the material to facilitate theflovr of the material from the tray when it is turned with the open end downward.

in rotary weighing machine, trays lo- .the adjacent ends and the opposite ends with the open ends'upward to receive mate: rial and to he turned with the openends downward to discharge material, valves located in the adjacent endsof the trays and arranged to openand admit'airdnto the upper ends of the trays above the material Wher the trays turned with the open end downivard and facilitate the flow of material from the trays.

. In rotary Weighing machine, a lever centrally pivoted, a weight supported on one end of said lever and trays pivotally supported on-the other end of said lever, said trays located end to end with the-opposite valves therein and an air space between them, saidvalves arranged to open and ad ma air above the ri aterial when the trays are urned with the open ends downward, to fal the discharge of material, from the t c iitate trays; 4

4. rotary Weighing machine, a conveyer having opening for the discharge of material, a gate pivotally secured in position to close said" opening, a weight secured to said gateto hold it in-position, trays supported end to end, centrally pivoted, llaviu an air space between. the adjacent ends, and open at the opposite ends and arranged to stand with the open ends upward to receive material from the conveyor and to turn with the open ends downward to discharge material from the trays, valves-in the adjacent open and admit air above Jhe material when the trays are turned with the open ends ward and facilitate the discharge of matrozn the trays, lever and Weight for rring the trays and actuate my and gin'ojections on the trays in posi- .ion to actuate the rate on the conveyor.

signed at Grandvnle lvjl ichi 'an March 17th ere-inlet open, said trays constructed to. be placed.

ends open and the adjacent ends having ends of the CRF'YSSO arranged that they Willsated end to end. with. an air space between 

